Trying to bottom align a hover over tooltip span window

Hi,
I am using a simple hover over tooltip, which works very well, the trouble I have is, if the hover over is near the bottom of the page, it often drags the hover window off the bottom..... What I want to do is align the bottom of the hover window to the bottom of the div, resulting in it always showing. This is the CSS code to make the hover over tooltip appear:

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In tooltip span or tooltip or tool tiphover try something like: bottom:-100px; see what happens. One of those three css entries will control the position of the tooltip. the bottom -100px will show a dramatic change in the positon. From that, you can adjust the bottom: to suit your needs.

It would help if there was a url.

damianb123Author Commented: 2015-05-06

Hi,
It appears to be the .tooltip hover span which controls the position, and you are correct that adding a margin bottom does adjust the box, however there are approx 50 hover overs all pulled from the database, each with varying info within, so the size of the hover box changes greatly. I added this, vertical-align: bottom; but it made no difference.... Its on the last line of the tooltip hover span block.